In fact, she popped up in one of my dreams suddenly even though I didn't know she could actually enter in dreams like Luna does, but still. Anyway, she came up and said: "Why, in the name of the mighty Celestia, have you never drawn me like the other ponies?" And I replied: "Dunno, lol!"Then, after a good kick in my butt (where I still have a big red shape of a hoof), she take me to the magic land of Equestria where I was forced to draw the royal princess, with only a stick, a bottle of glue and some old cookies.But I managed to make it, I still don't know how, and so I win my freedom and a kick back to our world.

TL;DR: It's 3 a.m. here, I'm tired and I don't know what am I writing so enjoy the picture I made and tomorrow we'll see....

Well, I mean that the Crystal Empire was sealed away for a very long time. Cadance is clearly about the same age as Shining Armor, as we've seen her at a younger age in Twilight's flashback to her days being foalsat.